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An android, also known as a synthetic organism, is a robot designed to look like a human, with emphasis on realistic skin and movement. The name “android” has been used in science fiction stories in many different ways. The Oxford English Dictionary found that the earliest use of the word Android was most likely in Ephraim Chambers' Cyclopaedia, which referred to St. Albertus Magnus’s alleged automaton as Androides. In US patents, the term first appears in 1863 referring to small...

A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.